Is she avoiding me or just busy?

There's this girl that I met online a bunch of months back and we've discussed meeting in person and hopefully forming a relationship this summer. For a good amount of time, we flirted and talked a lot by text messaging and by voice. However, in the past several weeks, she has not been responding to many of my texts. I know that she has a lot of school work and says that she's very cramped with work. However, I would think that she would at least say she wouldn't talk. Furthermore, it appears that there's a guy who she's at least friends with, and I know that most of her friends are guys. However, the way she talks about him on Facebook seems very flirty. At the same time, however, her Facebook status says she is single, and she also seems to communicate with her guy friends in a flirty way. Do you think she's no longer interested in me, or do you think she's just so cramped with work/stressed out she doesn't have as much time to talk to me?
Is she avoiding me or just busy?
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